[sdiy] OT - looking for roland JX10 chorus details

[Mike Gorman]

Hi Dave,

I've just had a quick look on the Synfo site, here:

http://www.synfo.nl/

and found a copy of the Service Manual for the JX10. It does appear to use 2
off MN3009 in the phaser section (though unfortunately, that part of the
circuit diagram is missing from the scan).

Hope this helps.

Regards

Mike

-----Original Message-----
From: synth-diy-bounces at dropmix.xs4all.nl
[mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of Dave Kendall
Sent: 21 April 2012 11:48
To: synthdiy diy
Subject: [sdiy] OT - looking for roland JX10 chorus details

Hi All.

Apologies for the  slightly OT nature. For a particular project I'm breaking
down some JX10 patches, and porting them over to a Kurzweil K2661, where
they're being re-programmed using internal synth parameters and onboard FX.
99% of the synth architecture can be replicated satisfactorily, but the two
chorus units in the JX are a big part of the sound, and are proving elusive
to emulate. I'm not using samples, as they are static, and would be a vast
memory hog to even approach an accurate reproduction of the cyclic behaviour
of some of the patches.

Does anyone have a source of info on the chorus circuits used in the JX10? I
believe the design is a two-BBD thing, *possibly* similar to the BBD board
of the JH subtle chorus, but I'm not sure about this.

I'm looking for clues as to mod depth, delay, LFO shape and rate - that sort
of thing. If there is any EQ in there (a la Dimension D) it would be good to
know too. I've got some way along the road, but any details would really
help.
FWIW, the JX10 appears to be two JX8P main boards shoved in a long box with
a keyboard. It's rather cramped in there....

A schematic would be really fab :-)

cheers,
Dave

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